TM 11-5820-358-20 Organizational Maintenance Radio Receiver R-390A/URR 1961-02-20
"This annual covers the installation and second echelon maintenance of Radio Receiver R490A/URR. The operating instructions for this equipment are contained in TX 11-5820-858-10."
Digitized by the Combined Arms Research Library Digital Library, US Army Combined Arms Center. http://cgsc.cdmhost.com/cdm/